What software do I need to open pdf files?

The most common software used for opening and reading .pdf files is Adobe Acrobat Reader, a free download available from Adobe, the company responsible for inventing the format. PDF, or portable do...
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What software do you need to unzip or open compressed files?

You need a decompression utility, of which there are many available for download. However, if you are running a copy of Windows more recent than 1998, or Mac 10.3 or later, there is built-in zip su...
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What software do i need to be able to scan a document and then be able to edit it on my monitor?